I was able to test out the routine tricks with my Ring doorbell and Fire tablet, it worked as expected. I agreed that the 1st troubleshoot step would be getting the camera view showing on the tablet by asking Alexa to do so first.
I think this is a neat treat, but you may also want to set a rule to bring Fully Kiosk Browser back to the front for displaying the dashboard again once the exiting the camera view. Will need Fully Kiosk Browser device hander to do so.